en فضاهای بروالدی متقارن تعمیم یافته تخصصي Special پژوهشي Research paper <p>In this paper we study generalized symmetric Berwald spaces. We show that if a Berwald space $(M,F)$ admits a parallel $s-$structure then it is locally symmetric. For a complete Berwald space which admits a parallel s-structure we show that if the flag curvature of $(M,F)$ is everywhere nonzero, then $F$ is Riemannian.</p> Homogeneous Finsler space, Symmetric space, Generalized symmetric space, Berwald space. 63 69 http://ijmsi.ir/browse.php?a_code=A-10-368-1&slc_lang=en&sid=1 Parastoo Habibi پرستو حبیبی p.habibi@iau-astara.ac.ir 10031947532846002287 10031947532846002287 Yes Department of Mathematics گروه ریاضی Asadollah Razavi اسدالله رضوی arazavi@aut.ac.ir 10031947532846002288 10031947532846002288 No Faculty of Mathematics and Computer Science دانشکده ریاضی و علوم کامپیوتر